Lib/test/test_datetime.py

"""Test date/time type."""

import sys
import unittest

from test import test_support

from datetime import MINYEAR, MAXYEAR
from datetime import timedelta
from datetime import tzinfo
from datetime import time, timetz
from datetime import date, datetime, datetimetz

#############################################################################
# module tests

class TestModule(unittest.TestCase):

    def test_constants(self):
        import datetime
        self.assertEqual(datetime.MINYEAR, 1)
        self.assertEqual(datetime.MAXYEAR, 9999)

#############################################################################
# tzinfo tests

class FixedOffset(tzinfo):
    def __init__(self, offset, name, dstoffset=42):
        self.__offset = offset
        self.__name = name
        self.__dstoffset = dstoffset
    def __repr__(self):
        return self.__name.lower()
    def utcoffset(self, dt):
        return self.__offset
    def tzname(self, dt):
        return self.__name
    def dst(self, dt):
        return self.__dstoffset

class PicklableFixedOffset(FixedOffset):
    def __init__(self, offset=None, name=None, dstoffset=None):
        FixedOffset.__init__(self, offset, name, dstoffset)

class TestTZInfo(unittest.TestCase):

    def test_non_abstractness(self):
        # In order to allow subclasses to get pickled, the C implementation
        # wasn't able to get away with having __init__ raise
        # NotImplementedError.
        useless = tzinfo()
        dt = datetime.max
        self.assertRaises(NotImplementedError, useless.tzname, dt)
        self.assertRaises(NotImplementedError, useless.utcoffset, dt)
        self.assertRaises(NotImplementedError, useless.dst, dt)

    def test_subclass_must_override(self):
        class NotEnough(tzinfo):
            def __init__(self, offset, name):
                self.__offset = offset
                self.__name = name
        self.failUnless(issubclass(NotEnough, tzinfo))
        ne = NotEnough(3, "NotByALongShot")
        self.failUnless(isinstance(ne, tzinfo))

        dt = datetime.now()
        self.assertRaises(NotImplementedError, ne.tzname, dt)
        self.assertRaises(NotImplementedError, ne.utcoffset, dt)
        self.assertRaises(NotImplementedError, ne.dst, dt)

    def test_normal(self):
        fo = FixedOffset(3, "Three")
        self.failUnless(isinstance(fo, tzinfo))
        for dt in datetime.now(), None:
            self.assertEqual(fo.utcoffset(dt), 3)
            self.assertEqual(fo.tzname(dt), "Three")
            self.assertEqual(fo.dst(dt), 42)

    def test_pickling_base(self):
        import pickle, cPickle

        # There's no point to pickling tzinfo objects on their own (they
        # carry no data), but they need to be picklable anyway else
        # concrete subclasses can't be pickled.
        orig = tzinfo.__new__(tzinfo)
        self.failUnless(type(orig) is tzinfo)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.failUnless(type(derived) is tzinfo)

    def test_pickling_subclass(self):
        import pickle, cPickle

        # Make sure we can pickle/unpickle an instance of a subclass.
        orig = PicklableFixedOffset(-300, 'cookie')
        self.failUnless(isinstance(orig, tzinfo))
        self.failUnless(type(orig) is PicklableFixedOffset)
        self.assertEqual(orig.utcoffset(None), -300)
        self.assertEqual(orig.tzname(None), 'cookie')
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.failUnless(isinstance(derived, tzinfo))
                self.failUnless(type(derived) is PicklableFixedOffset)
                self.assertEqual(derived.utcoffset(None), -300)
                self.assertEqual(derived.tzname(None), 'cookie')

#############################################################################
# timedelta tests

class TestTimeDelta(unittest.TestCase):

    def test_constructor(self):
        eq = self.assertEqual
        td = timedelta

        # Check keyword args to constructor
        eq(td(), td(weeks=0, days=0, hours=0, minutes=0, seconds=0,
                    milliseconds=0, microseconds=0))
        eq(td(1), td(days=1))
        eq(td(0, 1), td(seconds=1))
        eq(td(0, 0, 1), td(microseconds=1))
        eq(td(weeks=1), td(days=7))
        eq(td(days=1), td(hours=24))
        eq(td(hours=1), td(minutes=60))
        eq(td(minutes=1), td(seconds=60))
        eq(td(seconds=1), td(milliseconds=1000))
        eq(td(milliseconds=1), td(microseconds=1000))

        # Check float args to constructor
        eq(td(weeks=1.0/7), td(days=1))
        eq(td(days=1.0/24), td(hours=1))
        eq(td(hours=1.0/60), td(minutes=1))
        eq(td(minutes=1.0/60), td(seconds=1))
        eq(td(seconds=0.001), td(milliseconds=1))
        eq(td(milliseconds=0.001), td(microseconds=1))

    def test_computations(self):
        eq = self.assertEqual
        td = timedelta

        a = td(7) # One week
        b = td(0, 60) # One minute
        c = td(0, 0, 1000) # One millisecond
        eq(a+b+c, td(7, 60, 1000))
        eq(a-b, td(6, 24*3600 - 60))
        eq(-a, td(-7))
        eq(+a, td(7))
        eq(-b, td(-1, 24*3600 - 60))
        eq(-c, td(-1, 24*3600 - 1, 999000))
        eq(abs(a), a)
        eq(abs(-a), a)
        eq(td(6, 24*3600), a)
        eq(td(0, 0, 60*1000000), b)
        eq(a*10, td(70))
        eq(a*10, 10*a)
        eq(a*10L, 10*a)
        eq(b*10, td(0, 600))
        eq(10*b, td(0, 600))
        eq(b*10L, td(0, 600))
        eq(c*10, td(0, 0, 10000))
        eq(10*c, td(0, 0, 10000))
        eq(c*10L, td(0, 0, 10000))
        eq(a*-1, -a)
        eq(b*-2, -b-b)
        eq(c*-2, -c+-c)
        eq(b*(60*24), (b*60)*24)
        eq(b*(60*24), (60*b)*24)
        eq(c*1000, td(0, 1))
        eq(1000*c, td(0, 1))
        eq(a//7, td(1))
        eq(b//10, td(0, 6))
        eq(c//1000, td(0, 0, 1))
        eq(a//10, td(0, 7*24*360))
        eq(a//3600000, td(0, 0, 7*24*1000))

    def test_disallowed_computations(self):
        a = timedelta(42)

        # Add/sub ints, longs, floats should be illegal
        for i in 1, 1L, 1.0:
            self.assertRaises(TypeError, lambda: a+i)
            self.assertRaises(TypeError, lambda: a-i)
            self.assertRaises(TypeError, lambda: i+a)
            self.assertRaises(TypeError, lambda: i-a)

        # Mul/div by float isn't supported.
        x = 2.3
        self.assertRaises(TypeError, lambda: a*x)
        self.assertRaises(TypeError, lambda: x*a)
        self.assertRaises(TypeError, lambda: a/x)
        self.assertRaises(TypeError, lambda: x/a)
        self.assertRaises(TypeError, lambda: a // x)
        self.assertRaises(TypeError, lambda: x // a)

        # Divison of int by timedelta doesn't make sense.
        # Division by zero doesn't make sense.
        for zero in 0, 0L:
            self.assertRaises(TypeError, lambda: zero // a)
            self.assertRaises(ZeroDivisionError, lambda: a // zero)

    def test_basic_attributes(self):
        days, seconds, us = 1, 7, 31
        td = timedelta(days, seconds, us)
        self.assertEqual(td.days, days)
        self.assertEqual(td.seconds, seconds)
        self.assertEqual(td.microseconds, us)

    def test_carries(self):
        t1 = timedelta(days=100,
                       weeks=-7,
                       hours=-24*(100-49),
                       minutes=-3,
                       seconds=12,
                       microseconds=(3*60 - 12) * 1e6 + 1)
        t2 = timedelta(microseconds=1)
        self.assertEqual(t1, t2)

    def test_hash_equality(self):
        t1 = timedelta(days=100,
                       weeks=-7,
                       hours=-24*(100-49),
                       minutes=-3,
                       seconds=12,
                       microseconds=(3*60 - 12) * 1000000)
        t2 = timedelta()
        self.assertEqual(hash(t1), hash(t2))

        t1 += timedelta(weeks=7)
        t2 += timedelta(days=7*7)
        self.assertEqual(t1, t2)
        self.assertEqual(hash(t1), hash(t2))

        d = {t1: 1}
        d[t2] = 2
        self.assertEqual(len(d), 1)
        self.assertEqual(d[t1], 2)

    def test_pickling(self):
        import pickle, cPickle
        args = 12, 34, 56
        orig = timedelta(*args)
        state = orig.__getstate__()
        self.assertEqual(args, state)
        derived = timedelta()
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

    def test_compare(self):
        t1 = timedelta(2, 3, 4)
        t2 = timedelta(2, 3, 4)
        self.failUnless(t1 == t2)
        self.failUnless(t1 <= t2)
        self.failUnless(t1 >= t2)
        self.failUnless(not t1 != t2)
        self.failUnless(not t1 < t2)
        self.failUnless(not t1 > t2)
        self.assertEqual(cmp(t1, t2), 0)
        self.assertEqual(cmp(t2, t1), 0)

        for args in (3, 3, 3), (2, 4, 4), (2, 3, 5):
            t2 = timedelta(*args)   # this is larger than t1
            self.failUnless(t1 < t2)
            self.failUnless(t2 > t1)
            self.failUnless(t1 <= t2)
            self.failUnless(t2 >= t1)
            self.failUnless(t1 != t2)
            self.failUnless(t2 != t1)
            self.failUnless(not t1 == t2)
            self.failUnless(not t2 == t1)
            self.failUnless(not t1 > t2)
            self.failUnless(not t2 < t1)
            self.failUnless(not t1 >= t2)
            self.failUnless(not t2 <= t1)
            self.assertEqual(cmp(t1, t2), -1)
            self.assertEqual(cmp(t2, t1), 1)

        for badarg in 10, 10L, 34.5, "abc", {}, [], ():
            self.assertRaises(TypeError, lambda: t1 == badarg)
            self.assertRaises(TypeError, lambda: t1 != badarg)
            self.assertRaises(TypeError, lambda: t1 <= badarg)
            self.assertRaises(TypeError, lambda: t1 < badarg)
            self.assertRaises(TypeError, lambda: t1 > badarg)
            self.assertRaises(TypeError, lambda: t1 >= badarg)
            self.assertRaises(TypeError, lambda: badarg == t1)
            self.assertRaises(TypeError, lambda: badarg != t1)
            self.assertRaises(TypeError, lambda: badarg <= t1)
            self.assertRaises(TypeError, lambda: badarg < t1)
            self.assertRaises(TypeError, lambda: badarg > t1)
            self.assertRaises(TypeError, lambda: badarg >= t1)

    def test_str(self):
        td = timedelta
        eq = self.assertEqual

        eq(str(td(1)), "1 day, 0:00:00")
        eq(str(td(-1)), "-1 day, 0:00:00")
        eq(str(td(2)), "2 days, 0:00:00")
        eq(str(td(-2)), "-2 days, 0:00:00")

        eq(str(td(hours=12, minutes=58, seconds=59)), "12:58:59")
        eq(str(td(hours=2, minutes=3, seconds=4)), "2:03:04")
        eq(str(td(weeks=-30, hours=23, minutes=12, seconds=34)),
           "-210 days, 23:12:34")

        eq(str(td(milliseconds=1)), "0:00:00.001000")
        eq(str(td(microseconds=3)), "0:00:00.000003")

        eq(str(td(days=999999999, hours=23, minutes=59, seconds=59,
                   microseconds=999999)),
           "999999999 days, 23:59:59.999999")

    def test_roundtrip(self):
        for td in (timedelta(days=999999999, hours=23, minutes=59,
                             seconds=59, microseconds=999999),
                   timedelta(days=-999999999),
                   timedelta(days=1, seconds=2, microseconds=3)):

            # Verify td -> string -> td identity.
            s = repr(td)
            self.failUnless(s.startswith('datetime.'))
            s = s[9:]
            td2 = eval(s)
            self.assertEqual(td, td2)

            # Verify identity via reconstructing from pieces.
            td2 = timedelta(td.days, td.seconds, td.microseconds)
            self.assertEqual(td, td2)

    def test_resolution_info(self):
        self.assert_(isinstance(timedelta.min, timedelta))
        self.assert_(isinstance(timedelta.max, timedelta))
        self.assert_(isinstance(timedelta.resolution, timedelta))
        self.assert_(timedelta.max > timedelta.min)
        self.assertEqual(timedelta.min, timedelta(-999999999))
        self.assertEqual(timedelta.max, timedelta(999999999, 24*3600-1, 1e6-1))
        self.assertEqual(timedelta.resolution, timedelta(0, 0, 1))

    def test_overflow(self):
        tiny = timedelta.resolution

        td = timedelta.min + tiny
        td -= tiny  # no problem
        self.assertRaises(OverflowError, td.__sub__, tiny)
        self.assertRaises(OverflowError, td.__add__, -tiny)

        td = timedelta.max - tiny
        td += tiny  # no problem
        self.assertRaises(OverflowError, td.__add__, tiny)
        self.assertRaises(OverflowError, td.__sub__, -tiny)

        self.assertRaises(OverflowError, lambda: -timedelta.max)

    def test_microsecond_rounding(self):
        td = timedelta
        eq = self.assertEqual

        # Single-field rounding.
        eq(td(milliseconds=0.4/1000), td(0))    # rounds to 0
        eq(td(milliseconds=-0.4/1000), td(0))    # rounds to 0
        eq(td(milliseconds=0.6/1000), td(microseconds=1))
        eq(td(milliseconds=-0.6/1000), td(microseconds=-1))

        # Rounding due to contributions from more than one field.
        us_per_hour = 3600e6
        us_per_day = us_per_hour * 24
        eq(td(days=.4/us_per_day), td(0))
        eq(td(hours=.2/us_per_hour), td(0))
        eq(td(days=.4/us_per_day, hours=.2/us_per_hour), td(microseconds=1))

        eq(td(days=-.4/us_per_day), td(0))
        eq(td(hours=-.2/us_per_hour), td(0))
        eq(td(days=-.4/us_per_day, hours=-.2/us_per_hour), td(microseconds=-1))

    def test_massive_normalization(self):
        td = timedelta(microseconds=-1)
        self.assertEqual((td.days, td.seconds, td.microseconds),
                         (-1, 24*3600-1, 999999))

    def test_bool(self):
        self.failUnless(timedelta(1))
        self.failUnless(timedelta(0, 1))
        self.failUnless(timedelta(0, 0, 1))
        self.failUnless(timedelta(microseconds=1))
        self.failUnless(not timedelta(0))

#############################################################################
# date tests

class TestDateOnly(unittest.TestCase):
    # Tests here won't pass if also run on datetime objects, so don't
    # subclass this to test datetimes too.

    def test_delta_non_days_ignored(self):
        dt = date(2000, 1, 2)
        delta = timedelta(days=1, hours=2, minutes=3, seconds=4,
                          microseconds=5)
        days = timedelta(delta.days)
        self.assertEqual(days, timedelta(1))

        dt2 = dt + delta
        self.assertEqual(dt2, dt + days)

        dt2 = delta + dt
        self.assertEqual(dt2, dt + days)

        dt2 = dt - delta
        self.assertEqual(dt2, dt - days)

        delta = -delta
        days = timedelta(delta.days)
        self.assertEqual(days, timedelta(-2))

        dt2 = dt + delta
        self.assertEqual(dt2, dt + days)

        dt2 = delta + dt
        self.assertEqual(dt2, dt + days)

        dt2 = dt - delta
        self.assertEqual(dt2, dt - days)

class TestDate(unittest.TestCase):
    # Tests here should pass for both dates and datetimes, except for a
    # few tests that TestDateTime overrides.

    theclass = date

    def test_basic_attributes(self):
        dt = self.theclass(2002, 3, 1)
        self.assertEqual(dt.year, 2002)
        self.assertEqual(dt.month, 3)
        self.assertEqual(dt.day, 1)

    def test_roundtrip(self):
        for dt in (self.theclass(1, 2, 3),
                   self.theclass.today()):
            # Verify dt -> string -> date identity.
            s = repr(dt)
            self.failUnless(s.startswith('datetime.'))
            s = s[9:]
            dt2 = eval(s)
            self.assertEqual(dt, dt2)

            # Verify identity via reconstructing from pieces.
            dt2 = self.theclass(dt.year, dt.month, dt.day)
            self.assertEqual(dt, dt2)

    def test_ordinal_conversions(self):
        # Check some fixed values.
        for y, m, d, n in [(1, 1, 1, 1),      # calendar origin
                           (1, 12, 31, 365),
                           (2, 1, 1, 366),
                           # first example from "Calendrical Calculations"
                           (1945, 11, 12, 710347)]:
            d = self.theclass(y, m, d)
            self.assertEqual(n, d.toordinal())
            fromord = self.theclass.fromordinal(n)
            self.assertEqual(d, fromord)
            if hasattr(fromord, "hour"):
                # if we're checking something fancier than a date, verify
                # the extra fields have been zeroed out
                self.assertEqual(fromord.hour, 0)
                self.assertEqual(fromord.minute, 0)
                self.assertEqual(fromord.second, 0)
                self.assertEqual(fromord.microsecond, 0)

        # Check first and last days of year across the whole range of years
        # supported.
        ordinal = 1
        for year in xrange(MINYEAR, MAXYEAR+1):
            # Verify (year, 1, 1) -> ordinal -> y, m, d is identity.
            d = self.theclass(year, 1, 1)
            n = d.toordinal()
            self.assertEqual(ordinal, n)
            d2 = self.theclass.fromordinal(n)
            self.assertEqual(d, d2)
            self.assertEqual(d.timetuple().tm_yday, 1)
            # Same for (year, 12, 31).
            isleap = year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)
            days_in_year = 365 + isleap
            d = self.theclass(year, 12, 31)
            n = d.toordinal()
            self.assertEqual(n, ordinal + days_in_year - 1)
            self.assertEqual(d.timetuple().tm_yday, days_in_year)
            d2 = self.theclass.fromordinal(n)
            self.assertEqual(d, d2)
            ordinal += days_in_year

        # Test every day in a leap-year and a non-leap year.
        dim = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        for year, isleap in (2000, True), (2002, False):
            n = self.theclass(year, 1, 1).toordinal()
            for month, maxday in zip(range(1, 13), dim):
                if month == 2 and isleap:
                    maxday += 1
                for day in range(1, maxday+1):
                    d = self.theclass(year, month, day)
                    self.assertEqual(d.toordinal(), n)
                    self.assertEqual(d, self.theclass.fromordinal(n))
                    n += 1

    def test_extreme_ordinals(self):
        a = self.theclass.min
        a = self.theclass(a.year, a.month, a.day)  # get rid of time parts
        aord = a.toordinal()
        b = a.fromordinal(aord)
        self.assertEqual(a, b)

        self.assertRaises(ValueError, lambda: a.fromordinal(aord - 1))

        b = a + timedelta(days=1)
        self.assertEqual(b.toordinal(), aord + 1)
        self.assertEqual(b, self.theclass.fromordinal(aord + 1))

        a = self.theclass.max
        a = self.theclass(a.year, a.month, a.day)  # get rid of time parts
        aord = a.toordinal()
        b = a.fromordinal(aord)
        self.assertEqual(a, b)

        self.assertRaises(ValueError, lambda: a.fromordinal(aord + 1))

        b = a - timedelta(days=1)
        self.assertEqual(b.toordinal(), aord - 1)
        self.assertEqual(b, self.theclass.fromordinal(aord - 1))

    def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32)

    def test_hash_equality(self):
        d = self.theclass(2000, 12, 31)
        # same thing
        e = self.theclass(2000, 12, 31)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

        d = self.theclass(2001,  1,  1)
        # same thing
        e = self.theclass(2001,  1,  1)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

    def test_computations(self):
        a = self.theclass(2002, 1, 31)
        b = self.theclass(1956, 1, 31)

        diff = a-b
        self.assertEqual(diff.days, 46*365 + len(range(1956, 2002, 4)))
        self.assertEqual(diff.seconds, 0)
        self.assertEqual(diff.microseconds, 0)

        day = timedelta(1)
        week = timedelta(7)
        a = self.theclass(2002, 3, 2)
        self.assertEqual(a + day, self.theclass(2002, 3, 3))
        self.assertEqual(day + a, self.theclass(2002, 3, 3))
        self.assertEqual(a - day, self.theclass(2002, 3, 1))
        self.assertEqual(-day + a, self.theclass(2002, 3, 1))
        self.assertEqual(a + week, self.theclass(2002, 3, 9))
        self.assertEqual(a - week, self.theclass(2002, 2, 23))
        self.assertEqual(a + 52*week, self.theclass(2003, 3, 1))
        self.assertEqual(a - 52*week, self.theclass(2001, 3, 3))
        self.assertEqual((a + week) - a, week)
        self.assertEqual((a + day) - a, day)
        self.assertEqual((a - week) - a, -week)
        self.assertEqual((a - day) - a, -day)
        self.assertEqual(a - (a + week), -week)
        self.assertEqual(a - (a + day), -day)
        self.assertEqual(a - (a - week), week)
        self.assertEqual(a - (a - day), day)

        # Add/sub ints, longs, floats should be illegal
        for i in 1, 1L, 1.0:
            self.assertRaises(TypeError, lambda: a+i)
            self.assertRaises(TypeError, lambda: a-i)
            self.assertRaises(TypeError, lambda: i+a)
            self.assertRaises(TypeError, lambda: i-a)

        # delta - date is senseless.
        self.assertRaises(TypeError, lambda: day - a)
        # mixing date and (delta or date) via * or // is senseless
        self.assertRaises(TypeError, lambda: day * a)
        self.assertRaises(TypeError, lambda: a * day)
        self.assertRaises(TypeError, lambda: day // a)
        self.assertRaises(TypeError, lambda: a // day)
        self.assertRaises(TypeError, lambda: a * a)
        self.assertRaises(TypeError, lambda: a // a)
        # date + date is senseless
        self.assertRaises(TypeError, lambda: a + a)

    def test_overflow(self):
        tiny = self.theclass.resolution

        dt = self.theclass.min + tiny
        dt -= tiny  # no problem
        self.assertRaises(OverflowError, dt.__sub__, tiny)
        self.assertRaises(OverflowError, dt.__add__, -tiny)

        dt = self.theclass.max - tiny
        dt += tiny  # no problem
        self.assertRaises(OverflowError, dt.__add__, tiny)
        self.assertRaises(OverflowError, dt.__sub__, -tiny)

    def test_fromtimestamp(self):
        import time

        # Try an arbitrary fixed value.
        year, month, day = 1999, 9, 19
        ts = time.mktime((year, month, day, 0, 0, 0, 0, 0, -1))
        d = self.theclass.fromtimestamp(ts)
        self.assertEqual(d.year, year)
        self.assertEqual(d.month, month)
        self.assertEqual(d.day, day)

    def test_today(self):
        import time

        # We claim that today() is like fromtimestamp(time.time()), so
        # prove it.
        for dummy in range(3):
            today = self.theclass.today()
            ts = time.time()
            todayagain = self.theclass.fromtimestamp(ts)
            if today == todayagain:
                break
            # There are several legit reasons that could fail:
            # 1. It recently became midnight, between the today() and the
            #    time() calls.
            # 2. The platform time() has such fine resolution that we'll
            #    never get the same value twice.
            # 3. The platform time() has poor resolution, and we just
            #    happened to call today() right before a resolution quantum
            #    boundary.
            # 4. The system clock got fiddled between calls.
            # In any case, wait a little while and try again.
            time.sleep(0.1)

        # It worked or it didn't.  If it didn't, assume it's reason #2, and
        # let the test pass if they're within half a second of each other.
        self.failUnless(today == todayagain or
                        abs(todayagain - today) < timedelta(seconds=0.5))

    def test_weekday(self):
        for i in range(7):
            # March 4, 2002 is a Monday
            self.assertEqual(self.theclass(2002, 3, 4+i).weekday(), i)
            self.assertEqual(self.theclass(2002, 3, 4+i).isoweekday(), i+1)
            # January 2, 1956 is a Monday
            self.assertEqual(self.theclass(1956, 1, 2+i).weekday(), i)
            self.assertEqual(self.theclass(1956, 1, 2+i).isoweekday(), i+1)

    def test_isocalendar(self):
        # Check examples from
        # http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm
        for i in range(7):
            d = self.theclass(2003, 12, 22+i)
            self.assertEqual(d.isocalendar(), (2003, 52, i+1))
            d = self.theclass(2003, 12, 29) + timedelta(i)
            self.assertEqual(d.isocalendar(), (2004, 1, i+1))
            d = self.theclass(2004, 1, 5+i)
            self.assertEqual(d.isocalendar(), (2004, 2, i+1))
            d = self.theclass(2009, 12, 21+i)
            self.assertEqual(d.isocalendar(), (2009, 52, i+1))
            d = self.theclass(2009, 12, 28) + timedelta(i)
            self.assertEqual(d.isocalendar(), (2009, 53, i+1))
            d = self.theclass(2010, 1, 4+i)
            self.assertEqual(d.isocalendar(), (2010, 1, i+1))

    def test_iso_long_years(self):
        # Calculate long ISO years and compare to table from
        # http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm
        ISO_LONG_YEARS_TABLE = """
              4   32   60   88
              9   37   65   93
             15   43   71   99
             20   48   76
             26   54   82

            105  133  161  189
            111  139  167  195
            116  144  172
            122  150  178
            128  156  184

            201  229  257  285
            207  235  263  291
            212  240  268  296
            218  246  274
            224  252  280

            303  331  359  387
            308  336  364  392
            314  342  370  398
            320  348  376
            325  353  381
        """
        iso_long_years = map(int, ISO_LONG_YEARS_TABLE.split())
        iso_long_years.sort()
        L = []
        for i in range(400):
            d = self.theclass(2000+i, 12, 31)
            d1 = self.theclass(1600+i, 12, 31)
            self.assertEqual(d.isocalendar()[1:], d1.isocalendar()[1:])
            if d.isocalendar()[1] == 53:
                L.append(i)
        self.assertEqual(L, iso_long_years)

    def test_isoformat(self):
        t = self.theclass(2, 3, 2)
        self.assertEqual(t.isoformat(), "0002-03-02")

    def test_ctime(self):
        t = self.theclass(2002, 3, 2)
        self.assertEqual(t.ctime(), "Sat Mar  2 00:00:00 2002")

    def test_strftime(self):
        t = self.theclass(2005, 3, 2)
        self.assertEqual(t.strftime("m:%m d:%d y:%y"), "m:03 d:02 y:05")

        self.assertRaises(TypeError, t.strftime) # needs an arg
        self.assertRaises(TypeError, t.strftime, "one", "two") # too many args
        self.assertRaises(TypeError, t.strftime, 42) # arg wrong type

        # A naive object replaces %z and %Z w/ empty strings.
        self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")

    def test_resolution_info(self):
        self.assert_(isinstance(self.theclass.min, self.theclass))
        self.assert_(isinstance(self.theclass.max, self.theclass))
        self.assert_(isinstance(self.theclass.resolution, timedelta))
        self.assert_(self.theclass.max > self.theclass.min)

    def test_extreme_timedelta(self):
        big = self.theclass.max - self.theclass.min
        # 3652058 days, 23 hours, 59 minutes, 59 seconds, 999999 microseconds
        n = (big.days*24*3600 + big.seconds)*1000000 + big.microseconds
        # n == 315537897599999999 ~= 2**58.13
        justasbig = timedelta(0, 0, n)
        self.assertEqual(big, justasbig)
        self.assertEqual(self.theclass.min + big, self.theclass.max)
        self.assertEqual(self.theclass.max - big, self.theclass.min)

    def test_timetuple(self):
        for i in range(7):
            # January 2, 1956 is a Monday (0)
            d = self.theclass(1956, 1, 2+i)
            t = d.timetuple()
            self.assertEqual(t, (1956, 1, 2+i, 0, 0, 0, i, 2+i, -1))
            # February 1, 1956 is a Wednesday (2)
            d = self.theclass(1956, 2, 1+i)
            t = d.timetuple()
            self.assertEqual(t, (1956, 2, 1+i, 0, 0, 0, (2+i)%7, 32+i, -1))
            # March 1, 1956 is a Thursday (3), and is the 31+29+1 = 61st day
            # of the year.
            d = self.theclass(1956, 3, 1+i)
            t = d.timetuple()
            self.assertEqual(t, (1956, 3, 1+i, 0, 0, 0, (3+i)%7, 61+i, -1))
            self.assertEqual(t.tm_year, 1956)
            self.assertEqual(t.tm_mon, 3)
            self.assertEqual(t.tm_mday, 1+i)
            self.assertEqual(t.tm_hour, 0)
            self.assertEqual(t.tm_min, 0)
            self.assertEqual(t.tm_sec, 0)
            self.assertEqual(t.tm_wday, (3+i)%7)
            self.assertEqual(t.tm_yday, 61+i)
            self.assertEqual(t.tm_isdst, -1)

    def test_pickling(self):
        import pickle, cPickle
        args = 6, 7, 23
        orig = self.theclass(*args)
        state = orig.__getstate__()
        self.assertEqual(state, '\x00\x06\x07\x17')
        derived = self.theclass(1, 1, 1)
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

    def test_compare(self):
        t1 = self.theclass(2, 3, 4)
        t2 = self.theclass(2, 3, 4)
        self.failUnless(t1 == t2)
        self.failUnless(t1 <= t2)
        self.failUnless(t1 >= t2)
        self.failUnless(not t1 != t2)
        self.failUnless(not t1 < t2)
        self.failUnless(not t1 > t2)
        self.assertEqual(cmp(t1, t2), 0)
        self.assertEqual(cmp(t2, t1), 0)

        for args in (3, 3, 3), (2, 4, 4), (2, 3, 5):
            t2 = self.theclass(*args)   # this is larger than t1
            self.failUnless(t1 < t2)
            self.failUnless(t2 > t1)
            self.failUnless(t1 <= t2)
            self.failUnless(t2 >= t1)
            self.failUnless(t1 != t2)
            self.failUnless(t2 != t1)
            self.failUnless(not t1 == t2)
            self.failUnless(not t2 == t1)
            self.failUnless(not t1 > t2)
            self.failUnless(not t2 < t1)
            self.failUnless(not t1 >= t2)
            self.failUnless(not t2 <= t1)
            self.assertEqual(cmp(t1, t2), -1)
            self.assertEqual(cmp(t2, t1), 1)

        for badarg in 10, 10L, 34.5, "abc", {}, [], ():
            self.assertRaises(TypeError, lambda: t1 == badarg)
            self.assertRaises(TypeError, lambda: t1 != badarg)
            self.assertRaises(TypeError, lambda: t1 <= badarg)
            self.assertRaises(TypeError, lambda: t1 < badarg)
            self.assertRaises(TypeError, lambda: t1 > badarg)
            self.assertRaises(TypeError, lambda: t1 >= badarg)
            self.assertRaises(TypeError, lambda: badarg == t1)
            self.assertRaises(TypeError, lambda: badarg != t1)
            self.assertRaises(TypeError, lambda: badarg <= t1)
            self.assertRaises(TypeError, lambda: badarg < t1)
            self.assertRaises(TypeError, lambda: badarg > t1)
            self.assertRaises(TypeError, lambda: badarg >= t1)

    def test_bool(self):
        # All dates are considered true.
        self.failUnless(self.theclass.min)
        self.failUnless(self.theclass.max)

    def test_srftime_out_of_range(self):
        # For nasty technical reasons, we can't handle years before 1900.
        cls = self.theclass
        self.assertEqual(cls(1900, 1, 1).strftime("%Y"), "1900")
        for y in 1, 49, 51, 99, 100, 1000, 1899:
            self.assertRaises(ValueError, cls(y, 1, 1).strftime, "%Y")

    def test_replace(self):
        cls = self.theclass
        args = [1, 2, 3]
        base = cls(*args)
        self.assertEqual(base, base.replace())

        i = 0
        for name, newval in (("year", 2),
                             ("month", 3),
                             ("day", 4)):
            newargs = args[:]
            newargs[i] = newval
            expected = cls(*newargs)
            got = base.replace(**{name: newval})
            self.assertEqual(expected, got)
            i += 1

        # Out of bounds.
        base = cls(2000, 2, 29)
        self.assertRaises(ValueError, base.replace, year=2001)

#############################################################################
# datetime tests

class TestDateTime(TestDate):

    theclass = datetime

    def test_basic_attributes(self):
        dt = self.theclass(2002, 3, 1, 12, 0)
        self.assertEqual(dt.year, 2002)
        self.assertEqual(dt.month, 3)
        self.assertEqual(dt.day, 1)
        self.assertEqual(dt.hour, 12)
        self.assertEqual(dt.minute, 0)
        self.assertEqual(dt.second, 0)
        self.assertEqual(dt.microsecond, 0)

    def test_basic_attributes_nonzero(self):
        # Make sure all attributes are non-zero so bugs in
        # bit-shifting access show up.
        dt = self.theclass(2002, 3, 1, 12, 59, 59, 8000)
        self.assertEqual(dt.year, 2002)
        self.assertEqual(dt.month, 3)
        self.assertEqual(dt.day, 1)
        self.assertEqual(dt.hour, 12)
        self.assertEqual(dt.minute, 59)
        self.assertEqual(dt.second, 59)
        self.assertEqual(dt.microsecond, 8000)

    def test_roundtrip(self):
        for dt in (self.theclass(1, 2, 3, 4, 5, 6, 7),
                   self.theclass.now()):
            # Verify dt -> string -> datetime identity.
            s = repr(dt)
            self.failUnless(s.startswith('datetime.'))
            s = s[9:]
            dt2 = eval(s)
            self.assertEqual(dt, dt2)

            # Verify identity via reconstructing from pieces.
            dt2 = self.theclass(dt.year, dt.month, dt.day,
                                dt.hour, dt.minute, dt.second,
                                dt.microsecond)
            self.assertEqual(dt, dt2)

    def test_isoformat(self):
        t = self.theclass(2, 3, 2, 4, 5, 1, 123)
        self.assertEqual(t.isoformat(),    "0002-03-02T04:05:01.000123")
        self.assertEqual(t.isoformat('T'), "0002-03-02T04:05:01.000123")
        self.assertEqual(t.isoformat(' '), "0002-03-02 04:05:01.000123")
        # str is ISO format with the separator forced to a blank.
        self.assertEqual(str(t), "0002-03-02 04:05:01.000123")

        t = self.theclass(2, 3, 2)
        self.assertEqual(t.isoformat(),    "0002-03-02T00:00:00")
        self.assertEqual(t.isoformat('T'), "0002-03-02T00:00:00")
        self.assertEqual(t.isoformat(' '), "0002-03-02 00:00:00")
        # str is ISO format with the separator forced to a blank.
        self.assertEqual(str(t), "0002-03-02 00:00:00")

    def test_more_ctime(self):
        # Test fields that TestDate doesn't touch.
        import time

        t = self.theclass(2002, 3, 2, 18, 3, 5, 123)
        self.assertEqual(t.ctime(), "Sat Mar  2 18:03:05 2002")
        # Oops!  The next line fails on Win2K under MSVC 6, so it's commented
        # out.  The difference is that t.ctime() produces " 2" for the day,
        # but platform ctime() produces "02" for the day.  According to
        # C99, t.ctime() is correct here.
        # self.assertEqual(t.ctime(), time.ctime(time.mktime(t.timetuple())))

        # So test a case where that difference doesn't matter.
        t = self.theclass(2002, 3, 22, 18, 3, 5, 123)
        self.assertEqual(t.ctime(), time.ctime(time.mktime(t.timetuple())))

    def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assert_(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assert_(dt1 < dt2)

    def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32)
        # bad hours
        self.theclass(2000, 1, 31, 0)    # no exception
        self.theclass(2000, 1, 31, 23)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, -1)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 24)
        # bad minutes
        self.theclass(2000, 1, 31, 23, 0)    # no exception
        self.theclass(2000, 1, 31, 23, 59)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, -1)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 60)
        # bad seconds
        self.theclass(2000, 1, 31, 23, 59, 0)    # no exception
        self.theclass(2000, 1, 31, 23, 59, 59)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 59, -1)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 59, 60)
        # bad microseconds
        self.theclass(2000, 1, 31, 23, 59, 59, 0)    # no exception
        self.theclass(2000, 1, 31, 23, 59, 59, 999999)   # no exception
        self.assertRaises(ValueError, self.theclass,
                          2000, 1, 31, 23, 59, 59, -1)
        self.assertRaises(ValueError, self.theclass,
                          2000, 1, 31, 23, 59, 59,
                          1000000)

    def test_hash_equality(self):
        d = self.theclass(2000, 12, 31, 23, 30, 17)
        e = self.theclass(2000, 12, 31, 23, 30, 17)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

        d = self.theclass(2001,  1,  1,  0,  5, 17)
        e = self.theclass(2001,  1,  1,  0,  5, 17)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

    def test_computations(self):
        a = self.theclass(2002, 1, 31)
        b = self.theclass(1956, 1, 31)
        diff = a-b
        self.assertEqual(diff.days, 46*365 + len(range(1956, 2002, 4)))
        self.assertEqual(diff.seconds, 0)
        self.assertEqual(diff.microseconds, 0)
        a = self.theclass(2002, 3, 2, 17, 6)
        millisec = timedelta(0, 0, 1000)
        hour = timedelta(0, 3600)
        day = timedelta(1)
        week = timedelta(7)
        self.assertEqual(a + hour, self.theclass(2002, 3, 2, 18, 6))
        self.assertEqual(hour + a, self.theclass(2002, 3, 2, 18, 6))
        self.assertEqual(a + 10*hour, self.theclass(2002, 3, 3, 3, 6))
        self.assertEqual(a - hour, self.theclass(2002, 3, 2, 16, 6))
        self.assertEqual(-hour + a, self.theclass(2002, 3, 2, 16, 6))
        self.assertEqual(a - hour, a + -hour)
        self.assertEqual(a - 20*hour, self.theclass(2002, 3, 1, 21, 6))
        self.assertEqual(a + day, self.theclass(2002, 3, 3, 17, 6))
        self.assertEqual(a - day, self.theclass(2002, 3, 1, 17, 6))
        self.assertEqual(a + week, self.theclass(2002, 3, 9, 17, 6))
        self.assertEqual(a - week, self.theclass(2002, 2, 23, 17, 6))
        self.assertEqual(a + 52*week, self.theclass(2003, 3, 1, 17, 6))
        self.assertEqual(a - 52*week, self.theclass(2001, 3, 3, 17, 6))
        self.assertEqual((a + week) - a, week)
        self.assertEqual((a + day) - a, day)
        self.assertEqual((a + hour) - a, hour)
        self.assertEqual((a + millisec) - a, millisec)
        self.assertEqual((a - week) - a, -week)
        self.assertEqual((a - day) - a, -day)
        self.assertEqual((a - hour) - a, -hour)
        self.assertEqual((a - millisec) - a, -millisec)
        self.assertEqual(a - (a + week), -week)
        self.assertEqual(a - (a + day), -day)
        self.assertEqual(a - (a + hour), -hour)
        self.assertEqual(a - (a + millisec), -millisec)
        self.assertEqual(a - (a - week), week)
        self.assertEqual(a - (a - day), day)
        self.assertEqual(a - (a - hour), hour)
        self.assertEqual(a - (a - millisec), millisec)
        self.assertEqual(a + (week + day + hour + millisec),
                         self.theclass(2002, 3, 10, 18, 6, 0, 1000))
        self.assertEqual(a + (week + day + hour + millisec),
                         (((a + week) + day) + hour) + millisec)
        self.assertEqual(a - (week + day + hour + millisec),
                         self.theclass(2002, 2, 22, 16, 5, 59, 999000))
        self.assertEqual(a - (week + day + hour + millisec),
                         (((a - week) - day) - hour) - millisec)
        # Add/sub ints, longs, floats should be illegal
        for i in 1, 1L, 1.0:
            self.assertRaises(TypeError, lambda: a+i)
            self.assertRaises(TypeError, lambda: a-i)
            self.assertRaises(TypeError, lambda: i+a)
            self.assertRaises(TypeError, lambda: i-a)

        # delta - datetime is senseless.
        self.assertRaises(TypeError, lambda: day - a)
        # mixing datetime and (delta or datetime) via * or // is senseless
        self.assertRaises(TypeError, lambda: day * a)
        self.assertRaises(TypeError, lambda: a * day)
        self.assertRaises(TypeError, lambda: day // a)
        self.assertRaises(TypeError, lambda: a // day)
        self.assertRaises(TypeError, lambda: a * a)
        self.assertRaises(TypeError, lambda: a // a)
        # datetime + datetime is senseless
        self.assertRaises(TypeError, lambda: a + a)

    def test_pickling(self):
        import pickle, cPickle
        args = 6, 7, 23, 20, 59, 1, 64**2
        orig = self.theclass(*args)
        state = orig.__getstate__()
        self.assertEqual(state, '\x00\x06\x07\x17\x14\x3b\x01\x00\x10\x00')
        derived = self.theclass(1, 1, 1)
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

    def test_more_compare(self):
        # The test_compare() inherited from TestDate covers the error cases.
        # We just want to test lexicographic ordering on the members datetime
        # has that date lacks.
        args = [2000, 11, 29, 20, 58, 16, 999998]
        t1 = self.theclass(*args)
        t2 = self.theclass(*args)
        self.failUnless(t1 == t2)
        self.failUnless(t1 <= t2)
        self.failUnless(t1 >= t2)
        self.failUnless(not t1 != t2)
        self.failUnless(not t1 < t2)
        self.failUnless(not t1 > t2)
        self.assertEqual(cmp(t1, t2), 0)
        self.assertEqual(cmp(t2, t1), 0)

        for i in range(len(args)):
            newargs = args[:]
            newargs[i] = args[i] + 1
            t2 = self.theclass(*newargs)   # this is larger than t1
            self.failUnless(t1 < t2)
            self.failUnless(t2 > t1)
            self.failUnless(t1 <= t2)
            self.failUnless(t2 >= t1)
            self.failUnless(t1 != t2)
            self.failUnless(t2 != t1)
            self.failUnless(not t1 == t2)
            self.failUnless(not t2 == t1)
            self.failUnless(not t1 > t2)
            self.failUnless(not t2 < t1)
            self.failUnless(not t1 >= t2)
            self.failUnless(not t2 <= t1)
            self.assertEqual(cmp(t1, t2), -1)
            self.assertEqual(cmp(t2, t1), 1)


    # A helper for timestamp constructor tests.
    def verify_field_equality(self, expected, got):
        self.assertEqual(expected.tm_year, got.year)
        self.assertEqual(expected.tm_mon, got.month)
        self.assertEqual(expected.tm_mday, got.day)
        self.assertEqual(expected.tm_hour, got.hour)
        self.assertEqual(expected.tm_min, got.minute)
        self.assertEqual(expected.tm_sec, got.second)

    def test_fromtimestamp(self):
        import time

        ts = time.time()
        expected = time.localtime(ts)
        got = self.theclass.fromtimestamp(ts)
        self.verify_field_equality(expected, got)

    def test_utcfromtimestamp(self):
        import time

        ts = time.time()
        expected = time.gmtime(ts)
        got = self.theclass.utcfromtimestamp(ts)
        self.verify_field_equality(expected, got)

    def test_utcnow(self):
        import time

        # Call it a success if utcnow() and utcfromtimestamp() are within
        # a second of each other.
        tolerance = timedelta(seconds=1)
        for dummy in range(3):
            from_now = self.theclass.utcnow()
            from_timestamp = self.theclass.utcfromtimestamp(time.time())
            if abs(from_timestamp - from_now) <= tolerance:
                break
            # Else try again a few times.
        self.failUnless(abs(from_timestamp - from_now) <= tolerance)

    def test_more_timetuple(self):
        # This tests fields beyond those tested by the TestDate.test_timetuple.
        t = self.theclass(2004, 12, 31, 6, 22, 33)
        self.assertEqual(t.timetuple(), (2004, 12, 31, 6, 22, 33, 4, 366, -1))
        self.assertEqual(t.timetuple(),
                         (t.year, t.month, t.day,
                          t.hour, t.minute, t.second,
                          t.weekday(),
                          t.toordinal() - date(t.year, 1, 1).toordinal() + 1,
                          -1))
        tt = t.timetuple()
        self.assertEqual(tt.tm_year, t.year)
        self.assertEqual(tt.tm_mon, t.month)
        self.assertEqual(tt.tm_mday, t.day)
        self.assertEqual(tt.tm_hour, t.hour)
        self.assertEqual(tt.tm_min, t.minute)
        self.assertEqual(tt.tm_sec, t.second)
        self.assertEqual(tt.tm_wday, t.weekday())
        self.assertEqual(tt.tm_yday, t.toordinal() -
                                     date(t.year, 1, 1).toordinal() + 1)
        self.assertEqual(tt.tm_isdst, -1)

    def test_more_strftime(self):
        # This tests fields beyond those tested by the TestDate.test_strftime.
        t = self.theclass(2004, 12, 31, 6, 22, 33)
        self.assertEqual(t.strftime("%m %d %y %S %M %H %j"),
                                    "12 31 04 33 22 06 366")

    def test_extract(self):
        dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        self.assertEqual(dt.date(), date(2002, 3, 4))
        self.assertEqual(dt.time(), time(18, 45, 3, 1234))

    def test_combine(self):
        d = date(2002, 3, 4)
        t = time(18, 45, 3, 1234)
        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        combine = self.theclass.combine
        dt = combine(d, t)
        self.assertEqual(dt, expected)

        dt = combine(time=t, date=d)
        self.assertEqual(dt, expected)

        self.assertEqual(d, dt.date())
        self.assertEqual(t, dt.time())
        self.assertEqual(dt, combine(dt.date(), dt.time()))

        self.assertRaises(TypeError, combine) # need an arg
        self.assertRaises(TypeError, combine, d) # need two args
        self.assertRaises(TypeError, combine, t, d) # args reversed
        self.assertRaises(TypeError, combine, d, t, 1) # too many args
        self.assertRaises(TypeError, combine, "date", "time") # wrong types

    def test_replace(self):
        cls = self.theclass
        args = [1, 2, 3, 4, 5, 6, 7]
        base = cls(*args)
        self.assertEqual(base, base.replace())

        i = 0
        for name, newval in (("year", 2),
                             ("month", 3),
                             ("day", 4),
                             ("hour", 5),
                             ("minute", 6),
                             ("second", 7),
                             ("microsecond", 8)):
            newargs = args[:]
            newargs[i] = newval
            expected = cls(*newargs)
            got = base.replace(**{name: newval})
            self.assertEqual(expected, got)
            i += 1

        # Out of bounds.
        base = cls(2000, 2, 29)
        self.assertRaises(ValueError, base.replace, year=2001)

    def test_astimezone(self):
        # Pretty boring for a datetime!  datetimetz is more interesting here.
        dt = self.theclass.now()
        f = FixedOffset(44, "")
        for dtz in dt.astimezone(f), dt.astimezone(tz=f):
            self.failUnless(isinstance(dtz, datetimetz))
            self.assertEqual(dt.date(), dtz.date())
            self.assertEqual(dt.time(), dtz.time())
            self.failUnless(dtz.tzinfo is f)
            self.assertEqual(dtz.utcoffset(), timedelta(minutes=44))

        self.assertRaises(TypeError, dt.astimezone) # not enough args
        self.assertRaises(TypeError, dt.astimezone, f, f) # too many args
        self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type


class TestTime(unittest.TestCase):

    theclass = time

    def test_basic_attributes(self):
        t = self.theclass(12, 0)
        self.assertEqual(t.hour, 12)
        self.assertEqual(t.minute, 0)
        self.assertEqual(t.second, 0)
        self.assertEqual(t.microsecond, 0)

    def test_basic_attributes_nonzero(self):
        # Make sure all attributes are non-zero so bugs in
        # bit-shifting access show up.
        t = self.theclass(12, 59, 59, 8000)
        self.assertEqual(t.hour, 12)
        self.assertEqual(t.minute, 59)
        self.assertEqual(t.second, 59)
        self.assertEqual(t.microsecond, 8000)

    def test_roundtrip(self):
        t = self.theclass(1, 2, 3, 4)

        # Verify t -> string -> time identity.
        s = repr(t)
        self.failUnless(s.startswith('datetime.'))
        s = s[9:]
        t2 = eval(s)
        self.assertEqual(t, t2)

        # Verify identity via reconstructing from pieces.
        t2 = self.theclass(t.hour, t.minute, t.second,
                           t.microsecond)
        self.assertEqual(t, t2)

    def test_comparing(self):
        args = [1, 2, 3, 4]
        t1 = self.theclass(*args)
        t2 = self.theclass(*args)
        self.failUnless(t1 == t2)
        self.failUnless(t1 <= t2)
        self.failUnless(t1 >= t2)
        self.failUnless(not t1 != t2)
        self.failUnless(not t1 < t2)
        self.failUnless(not t1 > t2)
        self.assertEqual(cmp(t1, t2), 0)
        self.assertEqual(cmp(t2, t1), 0)

        for i in range(len(args)):
            newargs = args[:]
            newargs[i] = args[i] + 1
            t2 = self.theclass(*newargs)   # this is larger than t1
            self.failUnless(t1 < t2)
            self.failUnless(t2 > t1)
            self.failUnless(t1 <= t2)
            self.failUnless(t2 >= t1)
            self.failUnless(t1 != t2)
            self.failUnless(t2 != t1)
            self.failUnless(not t1 == t2)
            self.failUnless(not t2 == t1)
            self.failUnless(not t1 > t2)
            self.failUnless(not t2 < t1)
            self.failUnless(not t1 >= t2)
            self.failUnless(not t2 <= t1)
            self.assertEqual(cmp(t1, t2), -1)
            self.assertEqual(cmp(t2, t1), 1)

        for badarg in (10, 10L, 34.5, "abc", {}, [], (), date(1, 1, 1),
                       datetime(1, 1, 1, 1, 1), timedelta(9)):
            self.assertRaises(TypeError, lambda: t1 == badarg)
            self.assertRaises(TypeError, lambda: t1 != badarg)
            self.assertRaises(TypeError, lambda: t1 <= badarg)
            self.assertRaises(TypeError, lambda: t1 < badarg)
            self.assertRaises(TypeError, lambda: t1 > badarg)
            self.assertRaises(TypeError, lambda: t1 >= badarg)
            self.assertRaises(TypeError, lambda: badarg == t1)
            self.assertRaises(TypeError, lambda: badarg != t1)
            self.assertRaises(TypeError, lambda: badarg <= t1)
            self.assertRaises(TypeError, lambda: badarg < t1)
            self.assertRaises(TypeError, lambda: badarg > t1)
            self.assertRaises(TypeError, lambda: badarg >= t1)

    def test_bad_constructor_arguments(self):
        # bad hours
        self.theclass(0, 0)    # no exception
        self.theclass(23, 0)   # no exception
        self.assertRaises(ValueError, self.theclass, -1, 0)
        self.assertRaises(ValueError, self.theclass, 24, 0)
        # bad minutes
        self.theclass(23, 0)    # no exception
        self.theclass(23, 59)   # no exception
        self.assertRaises(ValueError, self.theclass, 23, -1)
        self.assertRaises(ValueError, self.theclass, 23, 60)
        # bad seconds
        self.theclass(23, 59, 0)    # no exception
        self.theclass(23, 59, 59)   # no exception
        self.assertRaises(ValueError, self.theclass, 23, 59, -1)
        self.assertRaises(ValueError, self.theclass, 23, 59, 60)
        # bad microseconds
        self.theclass(23, 59, 59, 0)        # no exception
        self.theclass(23, 59, 59, 999999)   # no exception
        self.assertRaises(ValueError, self.theclass, 23, 59, 59, -1)
        self.assertRaises(ValueError, self.theclass, 23, 59, 59, 1000000)

    def test_hash_equality(self):
        d = self.theclass(23, 30, 17)
        e = self.theclass(23, 30, 17)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

        d = self.theclass(0,  5, 17)
        e = self.theclass(0,  5, 17)
        self.assertEqual(d, e)
        self.assertEqual(hash(d), hash(e))

        dic = {d: 1}
        dic[e] = 2
        self.assertEqual(len(dic), 1)
        self.assertEqual(dic[d], 2)
        self.assertEqual(dic[e], 2)

    def test_isoformat(self):
        t = self.theclass(4, 5, 1, 123)
        self.assertEqual(t.isoformat(), "04:05:01.000123")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass()
        self.assertEqual(t.isoformat(), "00:00:00")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=1)
        self.assertEqual(t.isoformat(), "00:00:00.000001")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=10)
        self.assertEqual(t.isoformat(), "00:00:00.000010")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=100)
        self.assertEqual(t.isoformat(), "00:00:00.000100")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=1000)
        self.assertEqual(t.isoformat(), "00:00:00.001000")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=10000)
        self.assertEqual(t.isoformat(), "00:00:00.010000")
        self.assertEqual(t.isoformat(), str(t))

        t = self.theclass(microsecond=100000)
        self.assertEqual(t.isoformat(), "00:00:00.100000")
        self.assertEqual(t.isoformat(), str(t))

    def test_strftime(self):
        t = self.theclass(1, 2, 3, 4)
        self.assertEqual(t.strftime('%H %M %S'), "01 02 03")
        # A naive object replaces %z and %Z with empty strings.
        self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")

    def test_str(self):
        self.assertEqual(str(self.theclass(1, 2, 3, 4)), "01:02:03.000004")
        self.assertEqual(str(self.theclass(10, 2, 3, 4000)), "10:02:03.004000")
        self.assertEqual(str(self.theclass(0, 2, 3, 400000)), "00:02:03.400000")
        self.assertEqual(str(self.theclass(12, 2, 3, 0)), "12:02:03")
        self.assertEqual(str(self.theclass(23, 15, 0, 0)), "23:15:00")

    def test_repr(self):
        name = 'datetime.' + self.theclass.__name__
        self.assertEqual(repr(self.theclass(1, 2, 3, 4)),
                         "%s(1, 2, 3, 4)" % name)
        self.assertEqual(repr(self.theclass(10, 2, 3, 4000)),
                         "%s(10, 2, 3, 4000)" % name)
        self.assertEqual(repr(self.theclass(0, 2, 3, 400000)),
                         "%s(0, 2, 3, 400000)" % name)
        self.assertEqual(repr(self.theclass(12, 2, 3, 0)),
                         "%s(12, 2, 3)" % name)
        self.assertEqual(repr(self.theclass(23, 15, 0, 0)),
                         "%s(23, 15)" % name)

    def test_resolution_info(self):
        self.assert_(isinstance(self.theclass.min, self.theclass))
        self.assert_(isinstance(self.theclass.max, self.theclass))
        self.assert_(isinstance(self.theclass.resolution, timedelta))
        self.assert_(self.theclass.max > self.theclass.min)

    def test_pickling(self):
        import pickle, cPickle
        args = 20, 59, 16, 64**2
        orig = self.theclass(*args)
        state = orig.__getstate__()
        self.assertEqual(state, '\x14\x3b\x10\x00\x10\x00')
        derived = self.theclass()
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

    def test_bool(self):
        cls = self.theclass
        self.failUnless(cls(1))
        self.failUnless(cls(0, 1))
        self.failUnless(cls(0, 0, 1))
        self.failUnless(cls(0, 0, 0, 1))
        self.failUnless(not cls(0))
        self.failUnless(not cls())

    def test_replace(self):
        cls = self.theclass
        args = [1, 2, 3, 4]
        base = cls(*args)
        self.assertEqual(base, base.replace())

        i = 0
        for name, newval in (("hour", 5),
                             ("minute", 6),
                             ("second", 7),
                             ("microsecond", 8)):
            newargs = args[:]
            newargs[i] = newval
            expected = cls(*newargs)
            got = base.replace(**{name: newval})
            self.assertEqual(expected, got)
            i += 1

        # Out of bounds.
        base = cls(1)
        self.assertRaises(ValueError, base.replace, hour=24)
        self.assertRaises(ValueError, base.replace, minute=-1)
        self.assertRaises(ValueError, base.replace, second=100)
        self.assertRaises(ValueError, base.replace, microsecond=1000000)

# A mixin for classes with a tzinfo= argument.  Subclasses must define
# theclass as a class atribute, and theclass(1, 1, 1, tzinfo=whatever)
# must be legit (which is true for timetz and datetimetz).
class TZInfoBase(unittest.TestCase):

    def test_bad_tzinfo_classes(self):
        cls = self.theclass
        self.assertRaises(TypeError, cls, 1, 1, 1, tzinfo=12)

        class NiceTry(object):
            def __init__(self): pass
            def utcoffset(self, dt): pass
        self.assertRaises(TypeError, cls, 1, 1, 1, tzinfo=NiceTry)

        class BetterTry(tzinfo):
            def __init__(self): pass
            def utcoffset(self, dt): pass
        b = BetterTry()
        t = cls(1, 1, 1, tzinfo=b)
        self.failUnless(t.tzinfo is b)

    def test_utc_offset_out_of_bounds(self):
        class Edgy(tzinfo):
            def __init__(self, offset):
                self.offset = offset
            def utcoffset(self, dt):
                return self.offset

        cls = self.theclass
        for offset, legit in ((-1440, False),
                              (-1439, True),
                              (1439, True),
                              (1440, False)):
            if cls is timetz:
                t = cls(1, 2, 3, tzinfo=Edgy(offset))
            elif cls is datetimetz:
                t = cls(6, 6, 6, 1, 2, 3, tzinfo=Edgy(offset))
            if legit:
                aofs = abs(offset)
                h, m = divmod(aofs, 60)
                tag = "%c%02d:%02d" % (offset < 0 and '-' or '+', h, m)
                if isinstance(t, datetimetz):
                    t = t.timetz()
                self.assertEqual(str(t), "01:02:03" + tag)
            else:
                self.assertRaises(ValueError, str, t)

    def test_tzinfo_classes(self):
        cls = self.theclass
        class C1(tzinfo):
            def utcoffset(self, dt): return None
            def dst(self, dt): return None
            def tzname(self, dt): return None
        for t in (cls(1, 1, 1),
                  cls(1, 1, 1, tzinfo=None),
                  cls(1, 1, 1, tzinfo=C1())):
            self.failUnless(t.utcoffset() is None)
            self.failUnless(t.dst() is None)
            self.failUnless(t.tzname() is None)

        class C2(tzinfo):
            def utcoffset(self, dt): return -1439
            def dst(self, dt): return 1439
            def tzname(self, dt): return "aname"
        class C3(tzinfo):
            def utcoffset(self, dt): return timedelta(minutes=-1439)
            def dst(self, dt): return timedelta(minutes=1439)
            def tzname(self, dt): return "aname"
        for t in cls(1, 1, 1, tzinfo=C2()), cls(1, 1, 1, tzinfo=C3()):
            self.assertEqual(t.utcoffset(), timedelta(minutes=-1439))
            self.assertEqual(t.dst(), timedelta(minutes=1439))
            self.assertEqual(t.tzname(), "aname")

        # Wrong types.
        class C4(tzinfo):
            def utcoffset(self, dt): return "aname"
            def dst(self, dt): return ()
            def tzname(self, dt): return 0
        t = cls(1, 1, 1, tzinfo=C4())
        self.assertRaises(TypeError, t.utcoffset)
        self.assertRaises(TypeError, t.dst)
        self.assertRaises(TypeError, t.tzname)

        # Offset out of range.
        class C5(tzinfo):
            def utcoffset(self, dt): return -1440
            def dst(self, dt): return 1440
        class C6(tzinfo):
            def utcoffset(self, dt): return timedelta(hours=-24)
            def dst(self, dt): return timedelta(hours=24)
        for t in cls(1, 1, 1, tzinfo=C5()), cls(1, 1, 1, tzinfo=C6()):
            self.assertRaises(ValueError, t.utcoffset)
            self.assertRaises(ValueError, t.dst)

        # Not a whole number of minutes.
        class C7(tzinfo):
            def utcoffset(self, dt): return timedelta(seconds=61)
            def dst(self, dt): return timedelta(microseconds=-81)
        t = cls(1, 1, 1, tzinfo=C7())
        self.assertRaises(ValueError, t.utcoffset)
        self.assertRaises(ValueError, t.dst)

    def test_aware_compare(self):
        cls = self.theclass

        # Primarily trying to ensure that utcoffset() gets called even if
        # the comparands have the same tzinfo member.  timetz comparison
        # didn't used to do so, although datetimetz comparison did.
        class OperandDependentOffset(tzinfo):
            def utcoffset(self, t):
                if t.minute < 10:
                    return t.minute # d0 and d1 equal after adjustment
                else:
                    return 59       # d2 off in the weeds

        base = cls(8, 9, 10, tzinfo=OperandDependentOffset())
        d0 = base.replace(minute=3)
        d1 = base.replace(minute=9)
        d2 = base.replace(minute=11)
        for x in d0, d1, d2:
            for y in d0, d1, d2:
                got = cmp(x, y)
                if (x is d0 or x is d1) and (y is d0 or y is d1):
                    expected = 0
                elif x is y is d2:
                    expected = 0
                elif x is d2:
                    expected = -1
                else:
                    assert y is d2
                    expected = 1
                self.assertEqual(got, expected)


class TestTimeTZ(TestTime, TZInfoBase):
    theclass = timetz

    def test_empty(self):
        t = self.theclass()
        self.assertEqual(t.hour, 0)
        self.assertEqual(t.minute, 0)
        self.assertEqual(t.second, 0)
        self.assertEqual(t.microsecond, 0)
        self.failUnless(t.tzinfo is None)

    def test_zones(self):
        est = FixedOffset(-300, "EST", 1)
        utc = FixedOffset(0, "UTC", -2)
        met = FixedOffset(60, "MET", 3)
        t1 = timetz( 7, 47, tzinfo=est)
        t2 = timetz(12, 47, tzinfo=utc)
        t3 = timetz(13, 47, tzinfo=met)
        t4 = timetz(microsecond=40)
        t5 = timetz(microsecond=40, tzinfo=utc)

        self.assertEqual(t1.tzinfo, est)
        self.assertEqual(t2.tzinfo, utc)
        self.assertEqual(t3.tzinfo, met)
        self.failUnless(t4.tzinfo is None)
        self.assertEqual(t5.tzinfo, utc)

        self.assertEqual(t1.utcoffset(), timedelta(minutes=-300))
        self.assertEqual(t2.utcoffset(), timedelta(minutes=0))
        self.assertEqual(t3.utcoffset(), timedelta(minutes=60))
        self.failUnless(t4.utcoffset() is None)
        self.assertRaises(TypeError, t1.utcoffset, "no args")

        self.assertEqual(t1.tzname(), "EST")
        self.assertEqual(t2.tzname(), "UTC")
        self.assertEqual(t3.tzname(), "MET")
        self.failUnless(t4.tzname() is None)
        self.assertRaises(TypeError, t1.tzname, "no args")

        self.assertEqual(t1.dst(), timedelta(minutes=1))
        self.assertEqual(t2.dst(), timedelta(minutes=-2))
        self.assertEqual(t3.dst(), timedelta(minutes=3))
        self.failUnless(t4.dst() is None)
        self.assertRaises(TypeError, t1.dst, "no args")

        self.assertEqual(hash(t1), hash(t2))
        self.assertEqual(hash(t1), hash(t3))
        self.assertEqual(hash(t2), hash(t3))

        self.assertEqual(t1, t2)
        self.assertEqual(t1, t3)
        self.assertEqual(t2, t3)
        self.assertRaises(TypeError, lambda: t4 == t5) # mixed tz-aware & naive
        self.assertRaises(TypeError, lambda: t4 < t5) # mixed tz-aware & naive
        self.assertRaises(TypeError, lambda: t5 < t4) # mixed tz-aware & naive

        self.assertEqual(str(t1), "07:47:00-05:00")
        self.assertEqual(str(t2), "12:47:00+00:00")
        self.assertEqual(str(t3), "13:47:00+01:00")
        self.assertEqual(str(t4), "00:00:00.000040")
        self.assertEqual(str(t5), "00:00:00.000040+00:00")

        self.assertEqual(t1.isoformat(), "07:47:00-05:00")
        self.assertEqual(t2.isoformat(), "12:47:00+00:00")
        self.assertEqual(t3.isoformat(), "13:47:00+01:00")
        self.assertEqual(t4.isoformat(), "00:00:00.000040")
        self.assertEqual(t5.isoformat(), "00:00:00.000040+00:00")

        d = 'datetime.timetz'
        self.assertEqual(repr(t1), d + "(7, 47, tzinfo=est)")
        self.assertEqual(repr(t2), d + "(12, 47, tzinfo=utc)")
        self.assertEqual(repr(t3), d + "(13, 47, tzinfo=met)")
        self.assertEqual(repr(t4), d + "(0, 0, 0, 40)")
        self.assertEqual(repr(t5), d + "(0, 0, 0, 40, tzinfo=utc)")

        self.assertEqual(t1.strftime("%H:%M:%S %%Z=%Z %%z=%z"),
                                     "07:47:00 %Z=EST %z=-0500")
        self.assertEqual(t2.strftime("%H:%M:%S %Z %z"), "12:47:00 UTC +0000")
        self.assertEqual(t3.strftime("%H:%M:%S %Z %z"), "13:47:00 MET +0100")

        yuck = FixedOffset(-1439, "%z %Z %%z%%Z")
        t1 = timetz(23, 59, tzinfo=yuck)
        self.assertEqual(t1.strftime("%H:%M %%Z='%Z' %%z='%z'"),
                                     "23:59 %Z='%z %Z %%z%%Z' %z='-2359'")

        # Check that an invalid tzname result raises an exception.
        class Badtzname(tzinfo):
            def tzname(self, dt): return 42
        t = timetz(2, 3, 4, tzinfo=Badtzname())
        self.assertEqual(t.strftime("%H:%M:%S"), "02:03:04")
        self.assertRaises(TypeError, t.strftime, "%Z")

    def test_hash_edge_cases(self):
        # Offsets that overflow a basic time.
        t1 = self.theclass(0, 1, 2, 3, tzinfo=FixedOffset(1439, ""))
        t2 = self.theclass(0, 0, 2, 3, tzinfo=FixedOffset(1438, ""))
        self.assertEqual(hash(t1), hash(t2))

        t1 = self.theclass(23, 58, 6, 100, tzinfo=FixedOffset(-1000, ""))
        t2 = self.theclass(23, 48, 6, 100, tzinfo=FixedOffset(-1010, ""))
        self.assertEqual(hash(t1), hash(t2))

    def test_pickling(self):
        import pickle, cPickle

        # Try one without a tzinfo.
        args = 20, 59, 16, 64**2
        orig = self.theclass(*args)
        state = orig.__getstate__()
        self.assertEqual(state, ('\x14\x3b\x10\x00\x10\x00',))
        derived = self.theclass()
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

        # Try one with a tzinfo.
        tinfo = PicklableFixedOffset(-300, 'cookie')
        orig = self.theclass(5, 6, 7, tzinfo=tinfo)
        state = orig.__getstate__()
        derived = self.theclass()
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        self.failUnless(isinstance(derived.tzinfo, PicklableFixedOffset))
        self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
        self.assertEqual(derived.tzname(), 'cookie')

        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)
                self.failUnless(isinstance(derived.tzinfo,
                                PicklableFixedOffset))
                self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
                self.assertEqual(derived.tzname(), 'cookie')

    def test_more_bool(self):
        # Test cases with non-None tzinfo.
        cls = self.theclass

        t = cls(0, tzinfo=FixedOffset(-300, ""))
        self.failUnless(t)

        t = cls(5, tzinfo=FixedOffset(-300, ""))
        self.failUnless(t)

        t = cls(5, tzinfo=FixedOffset(300, ""))
        self.failUnless(not t)

        t = cls(23, 59, tzinfo=FixedOffset(23*60 + 59, ""))
        self.failUnless(not t)

        # Mostly ensuring this doesn't overflow internally.
        t = cls(0, tzinfo=FixedOffset(23*60 + 59, ""))
        self.failUnless(t)

        # But this should yield a value error -- the utcoffset is bogus.
        t = cls(0, tzinfo=FixedOffset(24*60, ""))
        self.assertRaises(ValueError, lambda: bool(t))

        # Likewise.
        t = cls(0, tzinfo=FixedOffset(-24*60, ""))
        self.assertRaises(ValueError, lambda: bool(t))

    def test_replace(self):
        cls = self.theclass
        z100 = FixedOffset(100, "+100")
        zm200 = FixedOffset(timedelta(minutes=-200), "-200")
        args = [1, 2, 3, 4, z100]
        base = cls(*args)
        self.assertEqual(base, base.replace())

        i = 0
        for name, newval in (("hour", 5),
                             ("minute", 6),
                             ("second", 7),
                             ("microsecond", 8),
                             ("tzinfo", zm200)):
            newargs = args[:]
            newargs[i] = newval
            expected = cls(*newargs)
            got = base.replace(**{name: newval})
            self.assertEqual(expected, got)
            i += 1

        # Ensure we can get rid of a tzinfo.
        self.assertEqual(base.tzname(), "+100")
        base2 = base.replace(tzinfo=None)
        self.failUnless(base2.tzinfo is None)
        self.failUnless(base2.tzname() is None)

        # Ensure we can add one.
        base3 = base2.replace(tzinfo=z100)
        self.assertEqual(base, base3)
        self.failUnless(base.tzinfo is base3.tzinfo)

        # Out of bounds.
        base = cls(1)
        self.assertRaises(ValueError, base.replace, hour=24)
        self.assertRaises(ValueError, base.replace, minute=-1)
        self.assertRaises(ValueError, base.replace, second=100)
        self.assertRaises(ValueError, base.replace, microsecond=1000000)


class TestDateTimeTZ(TestDateTime, TZInfoBase):
    theclass = datetimetz

    def test_trivial(self):
        dt = self.theclass(1, 2, 3, 4, 5, 6, 7)
        self.assertEqual(dt.year, 1)
        self.assertEqual(dt.month, 2)
        self.assertEqual(dt.day, 3)
        self.assertEqual(dt.hour, 4)
        self.assertEqual(dt.minute, 5)
        self.assertEqual(dt.second, 6)
        self.assertEqual(dt.microsecond, 7)
        self.assertEqual(dt.tzinfo, None)

    def test_even_more_compare(self):
        # The test_compare() and test_more_compare() inherited from TestDate
        # and TestDateTime covered non-tzinfo cases.

        # Smallest possible after UTC adjustment.
        t1 = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, ""))
        # Largest possible after UTC adjustment.
        t2 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                           tzinfo=FixedOffset(-1439, ""))

        # Make sure those compare correctly, and w/o overflow.
        self.failUnless(t1 < t2)
        self.failUnless(t1 != t2)
        self.failUnless(t2 > t1)

        self.failUnless(t1 == t1)
        self.failUnless(t2 == t2)

        # Equal afer adjustment.
        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""))
        t2 = self.theclass(2, 1, 1, 3, 13, tzinfo=FixedOffset(3*60+13+2, ""))
        self.assertEqual(t1, t2)

        # Change t1 not to subtract a minute, and t1 should be larger.
        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(0, ""))
        self.failUnless(t1 > t2)

        # Change t1 to subtract 2 minutes, and t1 should be smaller.
        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(2, ""))
        self.failUnless(t1 < t2)

        # Back to the original t1, but make seconds resolve it.
        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""),
                           second=1)
        self.failUnless(t1 > t2)

        # Likewise, but make microseconds resolve it.
        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""),
                           microsecond=1)
        self.failUnless(t1 > t2)

        # Make t2 naive and it should fail.
        t2 = self.theclass.min
        self.assertRaises(TypeError, lambda: t1 == t2)
        self.assertEqual(t2, t2)

        # It's also naive if it has tzinfo but tzinfo.utcoffset() is None.
        class Naive(tzinfo):
            def utcoffset(self, dt): return None
        t2 = self.theclass(5, 6, 7, tzinfo=Naive())
        self.assertRaises(TypeError, lambda: t1 == t2)
        self.assertEqual(t2, t2)

        # OTOH, it's OK to compare two of these mixing the two ways of being
        # naive.
        t1 = self.theclass(5, 6, 7)
        self.assertEqual(t1, t2)

        # Try a bogus uctoffset.
        class Bogus(tzinfo):
            def utcoffset(self, dt): return 1440 # out of bounds
        t1 = self.theclass(2, 2, 2, tzinfo=Bogus())
        t2 = self.theclass(2, 2, 2, tzinfo=FixedOffset(0, ""))
        self.assertRaises(ValueError, lambda: t1 == t1)

    def test_pickling(self):
        import pickle, cPickle

        # Try one without a tzinfo.
        args = 6, 7, 23, 20, 59, 1, 64**2
        orig = self.theclass(*args)
        state = orig.__getstate__()
        self.assertEqual(state, ('\x00\x06\x07\x17\x14\x3b\x01\x00\x10\x00',))
        derived = self.theclass(1, 1, 1)
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)

        # Try one with a tzinfo.
        tinfo = PicklableFixedOffset(-300, 'cookie')
        orig = self.theclass(*args, **{'tzinfo': tinfo})
        state = orig.__getstate__()
        derived = self.theclass(1, 1, 1)
        derived.__setstate__(state)
        self.assertEqual(orig, derived)
        self.failUnless(isinstance(derived.tzinfo, PicklableFixedOffset))
        self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
        self.assertEqual(derived.tzname(), 'cookie')

        for pickler in pickle, cPickle:
            for binary in 0, 1:
                green = pickler.dumps(orig, binary)
                derived = pickler.loads(green)
                self.assertEqual(orig, derived)
                self.failUnless(isinstance(derived.tzinfo,
                                PicklableFixedOffset))
                self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
                self.assertEqual(derived.tzname(), 'cookie')

    def test_extreme_hashes(self):
        # If an attempt is made to hash these via subtracting the offset
        # then hashing a datetime object, OverflowError results.  The
        # Python implementation used to blow up here.
        t = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, ""))
        hash(t)
        t = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                          tzinfo=FixedOffset(-1439, ""))
        hash(t)

        # OTOH, an OOB offset should blow up.
        t = self.theclass(5, 5, 5, tzinfo=FixedOffset(-1440, ""))
        self.assertRaises(ValueError, hash, t)

    def test_zones(self):
        est = FixedOffset(-300, "EST")
        utc = FixedOffset(0, "UTC")
        met = FixedOffset(60, "MET")
        t1 = datetimetz(2002, 3, 19,  7, 47, tzinfo=est)
        t2 = datetimetz(2002, 3, 19, 12, 47, tzinfo=utc)
        t3 = datetimetz(2002, 3, 19, 13, 47, tzinfo=met)
        self.assertEqual(t1.tzinfo, est)
        self.assertEqual(t2.tzinfo, utc)
        self.assertEqual(t3.tzinfo, met)
        self.assertEqual(t1.utcoffset(), timedelta(minutes=-300))
        self.assertEqual(t2.utcoffset(), timedelta(minutes=0))
        self.assertEqual(t3.utcoffset(), timedelta(minutes=60))
        self.assertEqual(t1.tzname(), "EST")
        self.assertEqual(t2.tzname(), "UTC")
        self.assertEqual(t3.tzname(), "MET")
        self.assertEqual(hash(t1), hash(t2))
        self.assertEqual(hash(t1), hash(t3))
        self.assertEqual(hash(t2), hash(t3))
        self.assertEqual(t1, t2)
        self.assertEqual(t1, t3)
        self.assertEqual(t2, t3)
        self.assertEqual(str(t1), "2002-03-19 07:47:00-05:00")
        self.assertEqual(str(t2), "2002-03-19 12:47:00+00:00")
        self.assertEqual(str(t3), "2002-03-19 13:47:00+01:00")
        d = 'datetime.datetimetz(2002, 3, 19, '
        self.assertEqual(repr(t1), d + "7, 47, tzinfo=est)")
        self.assertEqual(repr(t2), d + "12, 47, tzinfo=utc)")
        self.assertEqual(repr(t3), d + "13, 47, tzinfo=met)")

    def test_combine(self):
        met = FixedOffset(60, "MET")
        d = date(2002, 3, 4)
        tz = timetz(18, 45, 3, 1234, tzinfo=met)
        dt = datetimetz.combine(d, tz)
        self.assertEqual(dt, datetimetz(2002, 3, 4, 18, 45, 3, 1234,
                                        tzinfo=met))

    def test_extract(self):
        met = FixedOffset(60, "MET")
        dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234, tzinfo=met)
        self.assertEqual(dt.date(), date(2002, 3, 4))
        self.assertEqual(dt.time(), time(18, 45, 3, 1234))
        self.assertEqual(dt.timetz(), timetz(18, 45, 3, 1234, tzinfo=met))

    def test_tz_aware_arithmetic(self):
        import random

        now = self.theclass.now()
        tz55 = FixedOffset(-330, "west 5:30")
        timeaware = now.timetz().replace(tzinfo=tz55)
        nowaware = self.theclass.combine(now.date(), timeaware)
        self.failUnless(nowaware.tzinfo is tz55)
        self.assertEqual(nowaware.timetz(), timeaware)

        # Can't mix aware and non-aware.
        self.assertRaises(TypeError, lambda: now - nowaware)
        self.assertRaises(TypeError, lambda: nowaware - now)

        # And adding datetimetz's doesn't make sense, aware or not.
        self.assertRaises(TypeError, lambda: now + nowaware)
        self.assertRaises(TypeError, lambda: nowaware + now)
        self.assertRaises(TypeError, lambda: nowaware + nowaware)

        # Subtracting should yield 0.
        self.assertEqual(now - now, timedelta(0))
        self.assertEqual(nowaware - nowaware, timedelta(0))

        # Adding a delta should preserve tzinfo.
        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
        nowawareplus = nowaware + delta
        self.failUnless(nowaware.tzinfo is tz55)
        nowawareplus2 = delta + nowaware
        self.failUnless(nowawareplus2.tzinfo is tz55)
        self.assertEqual(nowawareplus, nowawareplus2)

        # that - delta should be what we started with, and that - what we
        # started with should be delta.
        diff = nowawareplus - delta
        self.failUnless(diff.tzinfo is tz55)
        self.assertEqual(nowaware, diff)
        self.assertRaises(TypeError, lambda: delta - nowawareplus)
        self.assertEqual(nowawareplus - nowaware, delta)

        # Make up a random timezone.
        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
        # Attach it to nowawareplus.
        nowawareplus = nowawareplus.replace(tzinfo=tzr)
        self.failUnless(nowawareplus.tzinfo is tzr)
        # Make sure the difference takes the timezone adjustments into account.
        got = nowaware - nowawareplus
        # Expected:  (nowaware base - nowaware offset) -
        #            (nowawareplus base - nowawareplus offset) =
        #            (nowaware base - nowawareplus base) +
        #            (nowawareplus offset - nowaware offset) =
        #            -delta + nowawareplus offset - nowaware offset
        expected = nowawareplus.utcoffset() - nowaware.utcoffset() - delta
        self.assertEqual(got, expected)

        # Try max possible difference.
        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                            tzinfo=FixedOffset(-1439, "max"))
        maxdiff = max - min
        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
                                  timedelta(minutes=2*1439))

    def test_tzinfo_now(self):
        meth = self.theclass.now
        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
        base = meth()
        # Try with and without naming the keyword.
        off42 = FixedOffset(42, "42")
        another = meth(off42)
        again = meth(tzinfo=off42)
        self.failUnless(another.tzinfo is again.tzinfo)
        self.assertEqual(another.utcoffset(), timedelta(minutes=42))
        # Bad argument with and w/o naming the keyword.
        self.assertRaises(TypeError, meth, 16)
        self.assertRaises(TypeError, meth, tzinfo=16)
        # Bad keyword name.
        self.assertRaises(TypeError, meth, tinfo=off42)
        # Too many args.
        self.assertRaises(TypeError, meth, off42, off42)

    def test_tzinfo_fromtimestamp(self):
        import time
        meth = self.theclass.fromtimestamp
        ts = time.time()
        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
        base = meth(ts)
        # Try with and without naming the keyword.
        off42 = FixedOffset(42, "42")
        another = meth(ts, off42)
        again = meth(ts, tzinfo=off42)
        self.failUnless(another.tzinfo is again.tzinfo)
        self.assertEqual(another.utcoffset(), timedelta(minutes=42))
        # Bad argument with and w/o naming the keyword.
        self.assertRaises(TypeError, meth, ts, 16)
        self.assertRaises(TypeError, meth, ts, tzinfo=16)
        # Bad keyword name.
        self.assertRaises(TypeError, meth, ts, tinfo=off42)
        # Too many args.
        self.assertRaises(TypeError, meth, ts, off42, off42)
        # Too few args.
        self.assertRaises(TypeError, meth)

    def test_tzinfo_utcnow(self):
        meth = self.theclass.utcnow
        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
        base = meth()
        # Try with and without naming the keyword; for whatever reason,
        # utcnow() doesn't accept a tzinfo argument.
        off42 = FixedOffset(42, "42")
        self.assertRaises(TypeError, meth, off42)
        self.assertRaises(TypeError, meth, tzinfo=off42)

    def test_tzinfo_utcfromtimestamp(self):
        import time
        meth = self.theclass.utcfromtimestamp
        ts = time.time()
        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
        base = meth(ts)
        # Try with and without naming the keyword; for whatever reason,
        # utcfromtimestamp() doesn't accept a tzinfo argument.
        off42 = FixedOffset(42, "42")
        self.assertRaises(TypeError, meth, ts, off42)
        self.assertRaises(TypeError, meth, ts, tzinfo=off42)

    def test_tzinfo_timetuple(self):
        # TestDateTime tested most of this.  datetimetz adds a twist to the
        # DST flag.
        class DST(tzinfo):
            def __init__(self, dstvalue):
                self.dstvalue = dstvalue
            def dst(self, dt):
                return self.dstvalue

        cls = self.theclass
        for dstvalue, flag in (-33, 1), (33, 1), (0, 0), (None, -1):
            d = cls(1, 1, 1, 10, 20, 30, 40, tzinfo=DST(dstvalue))
            t = d.timetuple()
            self.assertEqual(1, t.tm_year)
            self.assertEqual(1, t.tm_mon)
            self.assertEqual(1, t.tm_mday)
            self.assertEqual(10, t.tm_hour)
            self.assertEqual(20, t.tm_min)
            self.assertEqual(30, t.tm_sec)
            self.assertEqual(0, t.tm_wday)
            self.assertEqual(1, t.tm_yday)
            self.assertEqual(flag, t.tm_isdst)

        # dst() returns wrong type.
        self.assertRaises(TypeError, cls(1, 1, 1, tzinfo=DST("x")).timetuple)

        # dst() at the edge.
        self.assertEqual(cls(1,1,1, tzinfo=DST(1439)).timetuple().tm_isdst, 1)
        self.assertEqual(cls(1,1,1, tzinfo=DST(-1439)).timetuple().tm_isdst, 1)

        # dst() out of range.
        self.assertRaises(ValueError, cls(1,1,1, tzinfo=DST(1440)).timetuple)
        self.assertRaises(ValueError, cls(1,1,1, tzinfo=DST(-1440)).timetuple)

    def test_utctimetuple(self):
        class DST(tzinfo):
            def __init__(self, dstvalue):
                self.dstvalue = dstvalue
            def dst(self, dt):
                return self.dstvalue

        cls = self.theclass
        # This can't work:  DST didn't implement utcoffset.
        self.assertRaises(NotImplementedError,
                          cls(1, 1, 1, tzinfo=DST(0)).utcoffset)

        class UOFS(DST):
            def __init__(self, uofs, dofs=None):
                DST.__init__(self, dofs)
                self.uofs = uofs
            def utcoffset(self, dt):
                return self.uofs

        # Ensure tm_isdst is 0 regardless of what dst() says:  DST is never
        # in effect for a UTC time.
        for dstvalue in -33, 33, 0, None:
            d = cls(1, 2, 3, 10, 20, 30, 40, tzinfo=UOFS(-53, dstvalue))
            t = d.utctimetuple()
            self.assertEqual(d.year, t.tm_year)
            self.assertEqual(d.month, t.tm_mon)
            self.assertEqual(d.day, t.tm_mday)
            self.assertEqual(11, t.tm_hour) # 20mm + 53mm = 1hn + 13mm
            self.assertEqual(13, t.tm_min)
            self.assertEqual(d.second, t.tm_sec)
            self.assertEqual(d.weekday(), t.tm_wday)
            self.assertEqual(d.toordinal() - date(1, 1, 1).toordinal() + 1,
                             t.tm_yday)
            self.assertEqual(0, t.tm_isdst)

        # At the edges, UTC adjustment can normalize into years out-of-range
        # for a datetime object.  Ensure that a correct timetuple is
        # created anyway.
        tiny = cls(MINYEAR, 1, 1, 0, 0, 37, tzinfo=UOFS(1439))
        # That goes back 1 minute less than a full day.
        t = tiny.utctimetuple()
        self.assertEqual(t.tm_year, MINYEAR-1)
        self.assertEqual(t.tm_mon, 12)
        self.assertEqual(t.tm_mday, 31)
        self.assertEqual(t.tm_hour, 0)
        self.assertEqual(t.tm_min, 1)
        self.assertEqual(t.tm_sec, 37)
        self.assertEqual(t.tm_yday, 366)    # "year 0" is a leap year
        self.assertEqual(t.tm_isdst, 0)

        huge = cls(MAXYEAR, 12, 31, 23, 59, 37, 999999, tzinfo=UOFS(-1439))
        # That goes forward 1 minute less than a full day.
        t = huge.utctimetuple()
        self.assertEqual(t.tm_year, MAXYEAR+1)
        self.assertEqual(t.tm_mon, 1)
        self.assertEqual(t.tm_mday, 1)
        self.assertEqual(t.tm_hour, 23)
        self.assertEqual(t.tm_min, 58)
        self.assertEqual(t.tm_sec, 37)
        self.assertEqual(t.tm_yday, 1)
        self.assertEqual(t.tm_isdst, 0)

    def test_tzinfo_isoformat(self):
        zero = FixedOffset(0, "+00:00")
        plus = FixedOffset(220, "+03:40")
        minus = FixedOffset(-231, "-03:51")
        unknown = FixedOffset(None, "")

        cls = self.theclass
        datestr = '0001-02-03'
        for ofs in None, zero, plus, minus, unknown:
            for us in 0, 987001:
                d = cls(1, 2, 3, 4, 5, 59, us, tzinfo=ofs)
                timestr = '04:05:59' + (us and '.987001' or '')
                ofsstr = ofs is not None and d.tzname() or ''
                tailstr = timestr + ofsstr
                iso = d.isoformat()
                self.assertEqual(iso, datestr + 'T' + tailstr)
                self.assertEqual(iso, d.isoformat('T'))
                self.assertEqual(d.isoformat('k'), datestr + 'k' + tailstr)
                self.assertEqual(str(d), datestr + ' ' + tailstr)

    def test_replace(self):
        cls = self.theclass
        z100 = FixedOffset(100, "+100")
        zm200 = FixedOffset(timedelta(minutes=-200), "-200")
        args = [1, 2, 3, 4, 5, 6, 7, z100]
        base = cls(*args)
        self.assertEqual(base, base.replace())

        i = 0
        for name, newval in (("year", 2),
                             ("month", 3),
                             ("day", 4),
                             ("hour", 5),
                             ("minute", 6),
                             ("second", 7),
                             ("microsecond", 8),
                             ("tzinfo", zm200)):
            newargs = args[:]
            newargs[i] = newval
            expected = cls(*newargs)
            got = base.replace(**{name: newval})
            self.assertEqual(expected, got)
            i += 1

        # Ensure we can get rid of a tzinfo.
        self.assertEqual(base.tzname(), "+100")
        base2 = base.replace(tzinfo=None)
        self.failUnless(base2.tzinfo is None)
        self.failUnless(base2.tzname() is None)

        # Ensure we can add one.
        base3 = base2.replace(tzinfo=z100)
        self.assertEqual(base, base3)
        self.failUnless(base.tzinfo is base3.tzinfo)

        # Out of bounds.
        base = cls(2000, 2, 29)
        self.assertRaises(ValueError, base.replace, year=2001)

    def test_more_astimezone(self):
        # The inherited test_astimezone covered some trivial and error cases.
        fnone = FixedOffset(None, "None")
        f44m = FixedOffset(44, "44")
        fm5h = FixedOffset(-timedelta(hours=5), "m300")

        dt = self.theclass.now(tzinfo=f44m)
        self.failUnless(dt.tzinfo is f44m)
        # Replacing with degenerate tzinfo doesn't do any adjustment.
        for x in dt.astimezone(fnone), dt.astimezone(tz=fnone):
            self.failUnless(x.tzinfo is fnone)
            self.assertEqual(x.date(), dt.date())
            self.assertEqual(x.time(), dt.time())
        # Ditt with None tz.
        x = dt.astimezone(tz=None)
        self.failUnless(x.tzinfo is None)
        self.assertEqual(x.date(), dt.date())
        self.assertEqual(x.time(), dt.time())
        # Ditto replacing with same tzinfo.
        x = dt.astimezone(dt.tzinfo)
        self.failUnless(x.tzinfo is f44m)
        self.assertEqual(x.date(), dt.date())
        self.assertEqual(x.time(), dt.time())

        # Replacing with different tzinfo does adjust.
        got = dt.astimezone(fm5h)
        self.failUnless(got.tzinfo is fm5h)
        self.assertEqual(got.utcoffset(), timedelta(hours=-5))
        expected = dt - dt.utcoffset()  # in effect, convert to UTC
        expected += fm5h.utcoffset(dt)  # and from there to local time
        expected = expected.replace(tzinfo=fm5h) # and attach new tzinfo
        self.assertEqual(got.date(), expected.date())
        self.assertEqual(got.time(), expected.time())
        self.assertEqual(got.timetz(), expected.timetz())
        self.failUnless(got.tzinfo is expected.tzinfo)
        self.assertEqual(got, expected)

    def test_aware_subtract(self):
        cls = self.theclass

        # Primarily trying to ensure that utcoffset() gets called even if
        # the operands have the same tzinfo member.  Subtraction didn't
        # used to do this, and it makes a difference for DST-aware tzinfo
        # instances.
        class OperandDependentOffset(tzinfo):
            def utcoffset(self, t):
                if t.minute < 10:
                    return t.minute # d0 and d1 equal after adjustment
                else:
                    return 59       # d2 off in the weeds

        base = cls(8, 9, 10, 11, 12, 13, 14, tzinfo=OperandDependentOffset())
        d0 = base.replace(minute=3)
        d1 = base.replace(minute=9)
        d2 = base.replace(minute=11)
        for x in d0, d1, d2:
            for y in d0, d1, d2:
                got = x - y
                if (x is d0 or x is d1) and (y is d0 or y is d1):
                    expected = timedelta(0)
                elif x is y is d2:
                    expected = timedelta(0)
                elif x is d2:
                    expected = timedelta(minutes=(11-59)-0)
                else:
                    assert y is d2
                    expected = timedelta(minutes=0-(11-59))
                self.assertEqual(got, expected)


def test_suite():
    allsuites = [unittest.makeSuite(klass, 'test')
                 for klass in (TestModule,
                               TestTZInfo,
                               TestTimeDelta,
                               TestDateOnly,
                               TestDate,
                               TestDateTime,
                               TestTime,
                               TestTimeTZ,
                               TestDateTimeTZ,
                              )
                ]
    return unittest.TestSuite(allsuites)

def test_main():
    import gc
    import sys

    thesuite = test_suite()
    lastrc = None
    while True:
        test_support.run_suite(thesuite)
        if 1:       # change to 0, under a debug build, for some leak detection
            break
        gc.collect()
        if gc.garbage:
            raise SystemError("gc.garbage not empty after test run: %r" %
                              gc.garbage)
        if hasattr(sys, 'gettotalrefcount'):
            thisrc = sys.gettotalrefcount()
            print >> sys.stderr, '*' * 10, 'total refs:', thisrc,
            if lastrc:
                print >> sys.stderr, 'delta:', thisrc - lastrc
            else:
                print >> sys.stderr
            lastrc = thisrc

if __name__ == "__main__":
    test_main()